<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
			.box{
				width: 900px;
				height: 300px;
				border: 1px solid #333;
				
				display: flex;
				justify-content: space-around;
				/*align-items: center;*/
				align-items: stretch;		/*在侧轴方向上拉伸,前提：子元素不要设置height*/
			}
			.item{
				width: 150px;
				/*height: 50px;*/
				background: orangered;
				border: 1px solid #fff;
			}
		</style>
	</head>
	<body>
		<div class="box">
			<div class="item">001</div>
			<div class="item">002</div>
			<div class="item">003</div>
		</div>
	</body>
</html>
